Method and apparatus for transmitting downlink reference signal in wireless communication system supporting multiple antennas

摘要

A method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas are discussed. A method for transmitting Channel State Information-Reference Signals (CSI-RSs) for eight or less antenna ports includes selecting one of a plurality of CSI-RS Resource Element (RE) groups defined on a data region of a downlink subframe and mapping CSI-RSs for the eight or less antenna ports to the selected CSI-RS RE group, and transmitting the downlink subframe in which the CSI-RSs for the eight or less antenna ports are mapped.

主权项

1. A method for transmitting channel state information-reference signals (CSI-RSs) for eight or less antenna ports, the method comprising:
transmitting, to a receiving end, the CSI-RSs in a downlink subframe; and receiving, from the receiving end, channel state information (CSI) measured based on the CSI-RSs, wherein the CSI-RSs are mapped to one resource element (RE) group among a plurality of RE groups, each RE group includes a plurality of REs, and each RE is defined by one subcarrier in one orthogonal frequency division multiplexing (OFDM) symbol, wherein, in a resource region defined by 14 OFDM symbols and 12 subcarriers in the downlink subframe, each of the plurality of RE groups for eight antenna ports includes:
a first RE set including four REs on two contiguous subcarriers in two contiguous OFDM symbols, anda second RE set including another four REs on another two contiguous subcarriers in the two contiguous OFDM symbols, and wherein the first RE set is separated from the second RE set by four subcarriers.